Adium also has a pretty insane way of matching URLs, that's been in use (and growing all the while) since 2004. http://hg.adium.im/adium-1.4/file/542aa252713b/

Adium also has a pretty insane way of matching URLs, that's been in use (and growing all the while) since 2004. http://hg.adium.im/adium-1.4/file/542aa252713b/Frameworks/AutoHyperlinks%20Framework/Source/AHLinkLexer.l http://hg.adium.im/adium-1.4/file/542aa252713b/Frameworks/Au... is the lexing part, and then there are other files in the same directory that do other little bits. The whole hyperlinks framework is under a BSD license.